Column layout (all messed up) AND template width issues

[mintlady]

Hi! I'm new to posting but I've searched the forums without much luck for my particular problem. I am using version 1.3.8. The example page in my shop is here:
http://www.twigsandhoney.com/catalog...dex&cPath=1_17
I installed the column layout addon. I am trying to have product listings in 3 neat columns. I have selected this in admin/product listing/layout style AND I chose 3 columns per row. In the link above, you can see that it is sporadic. Some rows have two columns and others have one. I read this thread with a similar problem:
http://www.zen-cart.com/forum/showthread.php?t=41025
I tried to adjust the mainwrapper in my style sheet and it looks like this:

/*wrappers - page or section containers*/
#mainWrapper {
background-color: #ffffff;
text-align: left;
vertical-align: top;
border: 1px solid #9a9a9a;
width: 1000px;
}

I have fiddled with this (which is my custom template) by changing the width to 750px, 1000px, 100%.... and nothing I do seems to change the width of my template (assuming that the size of the template is causing the columns to get all out of order).

Am I completely off base? Should I be looking for the fix in some other place? Any help would be greatly appreciated! I've been working on this for hours today and earlier this week.

[mintlady]

I'm not sure if it matters, but I wanted to add that this is what my tpl_header looks like:

<!--bof-navigation display-->
<div id="navMainWrapper">
<div id="navMain">
<ul class="back">
<li><?php echo '<a href="' . HTTP_SERVER . DIR_WS_CATALOG . '">'; ?><?php echo HEADER_TITLE_CATALOG; ?></a></li>
<?php if ($_SESSION['customer_id']) { ?>
<li><a href="<?php echo zen_href_link(FILENAME_LOGOFF, '', 'SSL'); ?>"><?php echo HEADER_TITLE_LOGOFF; ?></a></li>
<li><a href="<?php echo zen_href_link(FILENAME_ACCOUNT, '', 'SSL'); ?>"><?php echo HEADER_TITLE_MY_ACCOUNT; ?></a></li>
<?php
} else {
if (STORE_STATUS == '0') {
?>
<li><a href="<?php echo zen_href_link(FILENAME_LOGIN, '', 'SSL'); ?>"><?php echo HEADER_TITLE_LOGIN; ?></a></li>
<?php } } ?>

<?php if ($_SESSION['cart']->count_contents() != 0) { ?>
<li><a href="<?php echo zen_href_link(FILENAME_SHOPPING_CART, '', 'NONSSL'); ?>"><?php echo HEADER_TITLE_CART_CONTENTS; ?></a></li>
<li><a href="<?php echo zen_href_link(FILENAME_CHECKOUT_SHIPPING, '', 'SSL'); ?>"><?php echo HEADER_TITLE_CHECKOUT; ?></a></li>
<?php }?>
</ul>
</div>
<div id="navMainSearch"><?php require(DIR_WS_MODULES . 'sideboxes/search_header.php'); ?></div>
<br class="clearBoth" />
</div>
<!--eof-navigation display-->

<!--bof-header logo and navigation display-->
<?php
if (!isset($flag_disable_header) || !$flag_disable_header) {
?>

<div id="headerWrapper">
<!--bof-navigation display-->

<!--bof-branding display-->
<div id="logoWrapper">
<div id="logo"><?php echo '<a href="' . HTTP_SERVER . DIR_WS_CATALOG . '">' . zen_image($template->get_template_dir(HEADER_LOGO_IMAGE, DIR_WS_TEMPLATE,

$current_page_base,'images'). '/' . HEADER_LOGO_IMAGE, HEADER_ALT_TEXT) . '</a>'; ?></div>
<?php if (HEADER_SALES_TEXT != '' || (SHOW_BANNERS_GROUP_SET2 != '' && $banner = zen_banner_exists('dynamic', SHOW_BANNERS_GROUP_SET2))) { ?>
<div id="taglineWrapper">
<?php
if (HEADER_SALES_TEXT != '') {
?>
<div id="tagline"><?php echo HEADER_SALES_TEXT;?></div>
<?php
}
?>
<?php
if (SHOW_BANNERS_GROUP_SET2 != '' && $banner = zen_banner_exists('dynamic', SHOW_BANNERS_GROUP_SET2)) {
if ($banner->RecordCount() > 0) {
?>
<div id="bannerTwo" class="banners"><?php echo zen_display_banner('static', $banner);?></div>
<?php
}
}
?>
</div>
<?php } // no HEADER_SALES_TEXT or SHOW_BANNERS_GROUP_SET2 ?>
</div>
<br class="clearBoth" />
<!--eof-branding display-->

<!--eof-header logo and navigation display-->

<!--bof-optional categories tabs navigation display-->
<?php require($template->get_template_dir('tpl_modules_categories_tabs.php',DIR_WS_TEMPLATE, $current_page_base,'templates').

'/tpl_modules_categories_tabs.php'); ?>
<!--eof-optional categories tabs navigation display-->